Mankind abandoned the surface of the blue planet several decades ago, when an alien race of sentient machines descended from the stars andturned even mankind's most majestic cities into ruins and cinders.

All that had been left untouched were the deep sea colonies, which becamea final destination and safe haven for the last remaining survivors of Earth.

While the future seemed grim and uncertain, an entire generation was ableto grow up in peace, without ever having seen the world above.Stories about the surface soon replaced fairytales and caused every child'simagination to soar, to ponder and even to suffer sleepless nights.

Mankind's romantic dream of one day being able to return to the surface was born.

But what eventually came true was nothing but a nightmare.

When the GSA (Global Sea Alliance) disbanded, each nation re-established its own borders as territorial claims and quarrels over scarce ressourcesdivided mankind anew.

It was then, at the brink of war, when it appeared like the tide.

A legend, previously only travelling the seas of our imagination,as a dream, a myth, as songs and poems: the Aquageddon – a prototype battleship that mysteriously vanished, without a crew manning it, during an attack on the shipyard it was manufactured in.

But if the ocean didn't claim this legacy of the world's best engineers, then who did ?And why did it appear at a Merlesian prison, of all places ?